JPS59165598A - Measuring device of bent characteristics of bented earphone - Google Patents

Abstract

PURPOSE:To obtain the earphone characteristics equal to the human ears by means of an acoustic coupler of a simple structure by an operation processing to both acoustic impedance of human ears stored in a memory and sound pressure output of an earphone to be measured. CONSTITUTION:An earphone (not shown in the figure) to be measured is attached to an artificial ear 10 consisting of acoustic tubes 3 and 5 with a simple structure and stable characteristics, and the impulse response sound pressure of the earphone is measured by means of a microphone 2. The bend characteristics Hc (curve C) and the insertion gain Ginc of the earphone on the ear 10 are calculated from said response sound pressure with a prescribed operation. Then the bend characteristics Hr of a human ear (equation I ) and the insertion gain Ginr (equation II) are calculated from the acoustic impedance Zinr of the human ear stored in a memory and the impedance Zinc of the ear 10. Thus it is possible to obtain a result (curve A) which is almost equal to the actual characteristics (curve B) of the human ear without using an acoustic coupler such as a Zwislocki coupler, etc. having a complicated structure and unstable performance.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention calibrates hearing aids used by people with hearing loss.

Regarding the actual measuring device.

[Background of the invention]

Normally, when a hearing aid is applied to an individual person with hearing loss, a small hole called a vent is often made in the earphone of the hearing aid to adjust the characteristics of the earphone depending on the hearing loss of the person with hearing loss.

Here, we will describe the characteristics of vented earphones as number 5, including when the vents are attached and when they are not attached.

Vent ratio of sound pressure within the ear canal (or coupler).

It's called sex. Traditionally, the measurement of this venting characteristic involves:

As shown in FIG. 1(a), the cavity 1 has an internal volume of 2 cc.

A close-up of the external auditory canal of a so-called 2cc Cub 10 with a microphone 2 installed at the back, as shown in Figure 1(b).

Zwislock (Zwislock) installed an acoustic impedance element 4 and a microphone 2 corresponding to the large-scale eardrum in-vehicle dance at the back of a simulated acoustic tube (ear canal) 3.
i) A coupler is used. 1-.

However, the conventional measuring instrument shown in FIG. 1(a).

For the 2cc coupler, a close-up of the eardrum and outer ear.

2cc because it does not simulate road impedance.

Figure 2(a) shows the vent characteristics measured with the coupler.

b 1, which is significantly different from the vent characteristics in the close-up of (C).
．． .

Judgment of the measurement results required the experience of an expert and was not suitable for practical use.

Also, the Tubis Rocky coupler in Figure 1(b) is a human.

Faithful impedance of the ear's tympanic membrane and ear canal.

In order to reproduce this, a plurality of wall temperatures 41 and these cavities 4
1 and the external auditory canal 6, a thin tube 42 with a diameter of 02 to 07 mm, and an acoustic impedance element 4 made of a resistive material 43 filled in the cavity 41 are provided. 2.degree. (b) corresponds to the vent characteristics in the close-up 10 of FIG. 2 (C) to such an extent that there is no practical problem. but,.

The Tubis Rocky Kabra has a complex structure.

So, dirt, dust, etc. in the air are the thin tube 42 and the resistance material.

43, the impedance changes.

However, the i-7 has the disadvantage of unstable performance and must be disassembled, cleaned, and adjusted every time it is used.

Therefore, it was not suitable for practical use.

[Purpose of the invention]

The object of the present invention is to eliminate the above-mentioned conventional drawbacks.

Acoustic impedance 2° for simulating the large tympanic membrane
3. Even if a simple coupler without element 4 is used, 8.

A measurement that can determine the same vent characteristics as the ears.

It provides equipment.

[Summary of the invention]

For this reason, the present invention discovers the relationship between the vent characteristic 5 in close-up and the vent characteristic due to the coupler.

In addition, in order to calculate this relationship, we need to calculate the impedance of the photocoupler and the coupler.

Memory that stores values and the contents of memory and my.

It is equipped with a calculation unit 10 that performs calculation processing on the output of the crophon 2, and can be used for close-up analysis based on the vent characteristics of the coupler.

The objective is to estimate the vent characteristics.

[Embodiments of the invention]

This invention will be described in detail below. FIG. 3(a) is a diagram showing a state in which the earphone 11 and the earplug part 12 are attached to the coupler 13, as seen from the tip of the earplug part 12.

The human power impedance of coupler 13 is 2. n, , ,
Turnip.

The sound pressure inside the cell is indicated by PU. Figure 3(b) is shown in Figure 3(b).
a).

is an equivalent circuit simplified by electrical analogy, where U indicates the volume velocity generated by the earphone 11. this. .

・4・ In contrast, in FIG. 6(C), a vent 14 is opened in the earplug part 12.

Indicates the state of the coupler 13 in this state.

The sound pressure at that point is expressed as Pv. Figure 3(d) is the same as Figure 3(C).

This is an equivalent circuit based on a mechanical analogy, and Zv indicates the impedance at the 14° portion of the vent.

Normally, the earphone 11 produces a constant volume velocity U, so
The vent characteristic Hc measured by the coupler 13 is expressed by equation (1).

Using similar modeling, Pe in Daisha.

The component characteristic Hr is expressed by equation (2).

Here, Zinr is the large-scale input impedance obtained by adding the 15-channel volume of the external ear to the large-scale tympanic membrane impedance.

The relationship between the river and Hr is as shown in equation (1), equation (2), and equation (3).

In other words, equation (3) is the vent characteristic Hr in close-up.

For the vent characteristics measured with coupler 13 and the input of coupler 13.

Cainpedance 2. This means that it can be found from the large-scale input impedance Zinr. Toko.

The input impedance Zinc of the coupler 13 is 5 in the photo.
It does not need to be the same as the input impedance Zinr.

The present invention will be explained below using examples. No.

Figure 4 is a diagram showing the configuration of the present invention, and is a pseudo-head.

6 through the auricle 7 formed on the outer periphery of the acoustic tube 6.
, and at the end thereof, the diameter of the acoustic tube 3 is set.

An artificial ear is shown in which a small-diameter acoustic tube 5 is connected and a microphone 2 is provided on the side of the acoustic tube 3. This artificial ear was filed by the same applicant.
I filed a patent application as No. 1401.

However, this artificial ear is Daisha's acoustic in-vehicle device.

This is a simulation of the base using a simple method.

The vent characteristics do not match the vent characteristics determined by close-up.

The output of microphone 2 of this artificial ear is a cord. .

It is connected to the measuring device 100 through 21.　　.

In the measuring device 100, 102 is an input/output interface.

- Face, NEC Corporation IC: D8255
'It is made using AC-5. 104 is random access.

Memo IJ (R, AM), Ic manufactured by Hitachi, Ltd.
It is made using ``e'' HM6116. 106 is a lead only.

memory (ROM), IN installed IC: D271 (5) is used. 108 is the calculation unit (AT, U), ADV
ANCED'MICRODEVICE IC: A
Using M9511A-4.

Become. 110 is a central processing unit (CPU);
IC made by ゛'-Bu Co., Ltd.: LHoo8o is used. child.

Data is delivered from the CPU 110 to each part.

The data bus is used to instruct the operation of each part.

The second address bus is connected.゛The operation of each part will be explained below using FIG. 11 Microphone 2 is the sound pressure generated by the earphone attached to the acoustic tube of the artificial ear.

Sound pressure PU and vent size when there are many vents in the frame.

The sound pressure Py) when Microhonk.

The output of the measuring device 100 through the cord 21 is the number of people 1.
.

・　7　・ The input section 1021 of the camera interface 102 is connected.

and stored in the RAM 104. Transfer this data to ROM
Fast Fourier Transform (FFT) written in '106
P.

Convert to frequency domain data using a program.

Ru. At this time, the multiplication and addition is performed using AL and Uj08.
will be carried out. Repeat this procedure twice! C, earphones.

The sound pressure PU when there is no vent in the earplug section and the sound pressure Pv when there is a bend are measured.

Next, in order to find the vent characteristics of the artificial ear, "K, R"
Two frequency domain data stored in AM104 (
The ratio Hc (=PV/PU) of Pt+ and Pv) is R
, 0M104. The ALU 108. calculates according to the program written in the ALU 104. , and stores the calculation results in the RAM 104.・Finally, in order to calculate the vent characteristic Hr by close-up, use the formula (3) written in the ROM 106.
calculation,.

Programmed artificial ear input impedance Zinc s
.

Using the large input impedance ZInr, RAM1
Vent characteristics H by close-up of Hc stored at 04°
r.

Convert to The ALU 108 is also used for this calculation.

Ru. The data Hr obtained in this way is input/output 9,1
・8・ The output is output to an external display device (not shown) via the output terminal section 1022 of the counter 7/8 102. Examples of external display devices include a plotter and a cathode ray tube.

etc. are used.

FIG. 5 shows an example of vent characteristics measured using the embodiment shown in FIG. 4. In FIG. Same penchitto earphones.

This is the vent characteristic obtained at the output part of the microphone 2 of the artificial ear shown in Fig. 4 using the conventional measuring force 1 method. Since the characteristics of the artificial ear are different from those of the 2cc coupler shown in Figure 1(a), the vent characteristics obtained are also different from those of the 2cc coupler shown in Figure 2(a).On the other hand, A. The side measured using the same pent earphone and the 11th embodiment shown in FIG. 4 shows almost the same characteristics as the pent l't characteristic from the close-up.

〔Effect of the invention〕

As mentioned above, this invention uses a large copy of Cain.

B-Dance ZInr is stored in memory, (3)
Since it can be converted to the same vent characteristics as in the case of large-scale calculation, in principle, what kind of coupler can be used?

It becomes measurable even if it is used. Therefore, the structure is simple.

It is now possible to use a simple coupler, FIG.

There is no need to use a complex and unstable acoustic five-impedance element like the conventional example shown in (b).

There is no need for maintenance, complicated maintenance, or adjustment, and the reliability of data is also improved.

Also, a specific image is applied to the large-scale input impedance H,n.

If you enter the person's data and find the vent characteristics, 10th 1st
Individual differences, which was not possible with the conventional example shown in Figure (b).

It is also possible to calibrate hearing aids taking this into account.　　.

Furthermore, as shown in Figure 4, if we measure the vent characteristics with the artificial ear attached to the artificial ear 6 and the artificial ear 6 attached to the simulated torso, we can see that a human can use 15 peg earphones. I put on my hearing aids.

You can obtain characteristics close to the condition.

Ru.

[Brief explanation of drawings]

Figure 1 is a block diagram of the conventional vent characteristic measuring device, 20-Pla. Figure 2 is a diagram showing the vent characteristics measured with a conventional coupler and a close-up of the vent characteristics. Figure 3 is a detailed diagram of the vent characteristics of the present invention. In the diagram to explain, (a) is force. A diagram showing the state where earphones without vents are inserted into the plastic.
(b) is a circuit diagram ζ (C
) is a pair of vented earphones inserted into the coupler. (d) is a circuit diagram in which (C) is estimated to be replaced with an electric circuit, and FIG. 4 is a diagram showing vent characteristic measurement according to the present invention. FIG. FIG. 9 is a diagram showing the vent characteristics measured with a measuring device according to the above method, the vent characteristics measured by a conventional measurement method, and the vent characteristics measured by listening to the ear.・Acoustic tube, 6...pseudo-type,
157...Auricle, 11...Earphone, 12...Earplug, 13...Coupler, 14...Vent, 21...Microphone output cord, 100...Vent characteristic according to the present invention Measuring device, 2°, 11, 102... Input/output interface, 104... Random access memory (RAM), '106... Read only memory (ROM). 108... Arithmetic unit (ALU), 110... Central processing unit (CPU), 51021
...Input terminal section, 1022...Output terminal section. 0 5 ・12 ・Figure l (1;l) (b
) Fig. 2 Wave number (H2) Fig. 3 (ρ) (b) (C) (d) Fig. 4
Figure number! ; Number of matching figures (/-/z) Procedural amendments imported) Display of patent application 1982 Patent application No. 575,550,000 Name of the invention Relationship with the case of person correcting earphone characteristics measuring device Patent applicant Name (510 ) Hitachi, Ltd.
Subject of personal amendment: Title of the invention in the specification, the entire specification, and all drawings. Contents of the amendment As shown in the attached sheet. Amended Description 2, Claim 1, (α) A sound tube having an opening into which an earphone to be measured can be detachably attached, and a light and small sound tube connected to the end of the sound tube. (b) sound source means for generating sound information to the acoustic coupler; (c) pickup means coupled at the terminal end of the acoustic coupler for extracting sound pressure information within the coupler; d) At least the input impedance of the acoustic coupler (Z
inc), a large-scale input impedance (Zinr) obtained by adding the external auditory canal volume to the large-scale tympanic membrane impedance, and a memory means configured to store sound pressure information (CPu, Pv) in the acoustic coupler output from the pick-up means; (g) coupled to said memory means by an acoustic coupler; a characteristic calculating means for converting the earphone characteristics into earphone characteristics by close-up; (a) An earphone characteristic measuring device characterized by comprising: an output means coupled to the calculation means for outputting a calculation result. 2. In the earphone characteristic/measuring device according to claim 1, the memory means calculates the vent characteristic in a close-up of the penned earphone.The vent characteristic measured by the HcH acoustic coupler is calculated by the calculation means. An earphone characteristic measuring device that stores programs for 3. In the earphone characteristic measuring device according to claim 1, the memory means calculates the insertion gain in the close-up, where Ginc: the insertion gain actually measured by the acoustic coupler built in the pseudo analog, by the calculation means. An earphone characteristic measuring device that stores programs for 4. The earphone characteristic/measuring device according to claim 1, wherein the acoustic coupler is formed on the outer periphery of a pseudo-like human head. An ear provided inside the pseudo-like through the ear. A device for measuring the characteristics of phones. 5. Earphone characteristics according to claim 4. A measuring device for measuring characteristics of earphones, wherein the pseudo type is attached to a pseudo torso having the same external shape as a human body. 6. In the earphone characteristic measuring device according to claim 1, the sound source means includes a circuit that generates electrical impulses, and the generation period changes irregularly in a predetermined pattern so that the impulse response is equal to the memory means. An earphone characteristic measuring device that performs synchronous addition at 2. The earphone characteristic measuring device according to claim 1, wherein the acoustic coupler has an acoustic impedance of approximately 320 ohms. 3. Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to an earphone characteristic measuring device for calibrating earphones, for example, hearing aids used by people with hearing loss. [Background of the Invention] Normally, when a hearing aid is applied to an individual person with hearing loss, the characteristics of the earphone are often adjusted by making a small hole called a vent in the earphone depending on the hearing loss of the person with hearing loss. Here we will show you the characteristics of vented earphones. Therefore, the ratio of the sound pressure in the ear canal (or coupler) with and without the vent is called the vent characteristic. Conventionally, in order to measure this vent characteristic, a hearing aid to be measured is worn as shown in FIG. 1 (α). This is a so-called 2cc coupler in which a microphone 2 is provided at the back of a cavity 1 with an internal volume of 2cc. As shown in Figure 1(h), a close-up of the external auditory canal is simulated. The tympanic membrane of the human ear is located at the back of the acoustic tube (external auditory canal) 5. Zuri, which is equipped with an acoustic impedance element 4 and a microphone 2, which corresponds to dance.
i) A coupler is used. However, the conventional earphone characteristic measuring instrument shown in Figure 1 (
σ) 2CC coupler does not simulate the acoustic impedance of the eardrum/membrane and external auditory canal, so the 2CC coupler
The vent characteristic curve α in Figure 2 measured with a C coupler is significantly different from the vent characteristic in a close-up measured using a probe-cheap microphone, curve C in Figure 2, and the experience of an expert is required to judge the measurement results. It was necessary and impractical. In addition, in order to faithfully reproduce the impedance of the tympanic membrane and external auditory canal (see Fig. 1), the aluminum Tubis Rocky coupler has a plurality of cavities 41 and a diameter of 0.2 to 0.7 mm connecting these cavities 41 and the external auditory canal 3. Since the acoustic impedance element 4 is provided, which consists of a tube 42 and a resistive material 45 filled in the cavity 41, the vent characteristic (curve b in Fig. 2) measured with this tube rocky coupler has no practical problems. It corresponds to the vent characteristic in the close-up of curve C in Figure 2 to a certain degree. However, since the Tubis Rocky coupler has a complicated structure, dirt and dust in the air can be easily absorbed by the thin tube 42 and the resistance. If it adheres to the material 45, the impedance will change and the performance will be unstable.
The Tubis Rocky Coupler requires cleaning and adjustment when used, making maintenance complicated and expensive, and is inconvenient in practice. [Object of the Invention] The object of the present invention is to eliminate the above-mentioned conventional problems9 and to provide an acoustic instrument with a complicated structure for simulating a macrotympanic membrane. Simple and stable structure with no impedance elements. Using an acoustic coupler as an artificial ear with unique characteristics. Even like the same vent characteristics and insertion gain as Daisha. An object of the present invention is to provide an earphone characteristic measuring device capable of determining earphone characteristics. [Summary of the Invention] The present invention is based on the discovery of a specific relationship between the earphone characteristics, such as the vent characteristic, in the large image and the earphone characteristics due to the coupler.b In order to convert the characteristics from this relationship, the impedance of the large image is and a memory for storing the value of the impedance of the coupler simulating the close-up, respectively, and a calculation unit for calculating the contents of the memory and the sound pressure output of the microphone picked up in the coupler with respect to the earphone to be measured. [Embodiments of the Invention] First, the principle of measuring vent characteristics of vent earphones will be explained. FIG. 5(α) is a diagram showing a state in which the earphone 11 and the earplug part 12 are attached to the coupler 15. The input impedance of the coupler 15 seen from the tip of the earplug part t2 is Zinc, and the sound pressure inside the coupler 15 is Indicated by pu. FIG. 3(h) is an equivalent circuit obtained by simplifying FIG. 3(α) using an electrical model, and -U indicates the volume velocity of the sound wave generated by the earphone 11. On the other hand, FIG. 3(c) shows a state in which the vent 14 is opened in the earplug portion 12, and the sound pressure inside the coupler 1'5 in this state is indicated by Pυ. FIG. 3(d) is an equivalent circuit electrically analogous to FIG. 3(C), and Zv indicates the acoustic impedance of the ben 514 section.・Normally, the earphone 11 produces a constant volume velocity U. Therefore, Fig. 5(b)
, (d), the vent characteristic Hc measured by the coupler 15 is expressed by equation (1). Using similar modeling with respect to FIG. Sound pressure inside Daisha's external auditory canal with a vent installed. △ is inside the external auditory canal without a pv1 vent installed. With the sound pressure at △ as ptb, the vent characteristic Hr in close-up
is expressed by equation (2). Here, Zinr is outside the tympanic membrane impedance. This is the large-scale input impedance plus the auditory canal volume. The relationship between Hc and Ilr is expressed by equation (5) from equation (1) and equation (2).
)become that way. In other words, Equation (5) shows that the vent characteristic Hr in the large copy is the vent characteristic Hc measured by the coupler 15, the input impedance Zinc of the coupler 15, and the input impedance Z in the large copy.
This means that it can be found from 1rLr. -Here, the input impedance Zinc of the coupler 15 is the same as the input impedance Zity of the close-up. There's no need. Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 4(α) and FIG. 4(,6) are diagrams illustrating the configuration of the earphone characteristic measuring device according to the embodiment of the present invention, and
The auricle is formed around the outer circumference of the auricle. 7, and was provided inside the pseudo class 6. An acoustic tube 5 corresponding to the external auditory canal is provided, and its terminal end K is provided. 1 shows an artificial ear in which an acoustic tube 5 having a diameter smaller than that of the acoustic tube 5 is connected in series with the tube 5 to provide terminal impedance, and a microphone 2 is provided on the side of the acoustic tube 5. . An end 9 of the acoustic tube 5 that is not connected to the acoustic tube 3 is an open end. In which configuration, the acoustic tube 5 has a diameter of 7 to 8 fi and a length of 2
0 to 25, the diameter of the sound tube 5 is 5 to 5III+I, and the length is about 4771. A so-called vinyl tube was used as the acoustic tube 5, which was wound thinly and housed inside the pseudo head. This artificial ear is patent application No. 571-8140 filed by the same applicant.
Although a patent application has been filed as No. 1, this artificial ear is
Since the acoustic impedance of the large-scale model is simulated by the component blade method, the vent characteristics do not match the vent characteristics determined by the large-scale model. The output of microphone 2 of this artificial ear is a cord. It is connected to the measuring device 100 through 21. . In the measuring device 100, 102, 105, 105
teeth. It is an input/output interface. 107 is electrical. It is an impulse generator (IG) and is loud. It is used to drive the speaker 109. Nl,. is the keyboard. 104 is a random access memory (RAM) manufactured by Hitachi, Ltd. C: Made using HM 15N1s. 106 is a read-on 1 rememory (ROM'), and is an IN installed IC. It is made using D2716. 108 is an arithmetic unit (APU), which is manufactured by ADVANCED MICRO DEVICE IC,
・Y, [ru] using AM9511A 4. Reference numeral 110 denotes a central processing unit (Cp(J)), which uses an IC: LHOf380 manufactured by Sharp Corporation.
A data bus for transferring data from the 110 to each part, and an address bus for instructing the operation of each part.
Path is connected. The operation of each part will be explained below with reference to FIGS. 4(h) and 5. Pseudo-like earphones without vents. 6 into the external auditory canal section 5 of the artificial ear (500). Total. The measurement microphone 2 captures the impulse response sound pressure (Pu Ct) generated by an unvented earphone attached to the acoustic tube 3 of the artificial ear. Microho. The output of the pin 2 is sent to the measuring device 100 through the cord 21. Input interface 1020 including A/D converter
It is led to the input section 1021 and stored in the RAM 104. (501) Write this data to ROM+06. Built-in Fast Fourier Transform (FFT) program. Convert to frequency domain data using RAM. (502). The multiplication and addition at this time is 1,4.7)U2O5
It is executed by 10. Similarly, insert vented earphones into pseudo-class 6 and measure the impulse response sound pressure Pυ(t).505), and use FFT to measure the frequency response pv<
w) (504). Next, in order to find the vent characteristic Hc of the artificial ear, I
t4M104J/C Ratio of two frequency domain data (,7) u and pv ) stored Hty (=Pv/PtL
), RO. Execute the calculation of the above formula (1) written in M2O3.
The APU 108 calculates according to the program and stores the calculation results in the RAM 104 (505). ! o
. Finally, the vent characteristic Hr was calculated using a close-up image. Therefore, the sum of equation (5) written in ROM106VC. Calculation program, acoustic impedance at the end of the acoustic tube. 5200 using an acoustic tube model. Input impedance of artificial ear: xZinclE, A, G,
Based on eardrum impedance data from 15Shaw. Large-scale input impingement obtained using an acoustic tube model. -Using Dance Ziy, convert Hc stored in the RAM 104 into a close-up vent characteristic Hr ('50
6). ApUHJ8 is also used for this calculation, 1. The data Hr thus obtained is the output-interface 10! ; Output to the external display device via the +os output terminal section 1051 1051 (507)
. As the external display device, a plotter 201, a CRT/display 202, etc. are used. In this embodiment, it is possible to use a synchronous addition method that measures the improvement of s7n by actually measuring the impulse response many times. circuit that generates electrical impulses (CIG)
is controlled by CpUllolC so that the period of generation of electrical impulses changes irregularly in a predetermined pattern,
Effective in removing periodic noise from air conditioning, etc. In this example, the actually measured impulse response K. It has an added function to remove existing reflected waves, and can be used in conjunction with a method of installing sound-absorbing materials such as glass wool on the floor and walls, making it possible to perform measurements outside of the soy-free room. FIG. 6 shows the vent characteristics measured in the example shown in FIGS. 4(α) and (h)K. In FIG. 6, B is an example of vent characteristics taken from a close-up. C is the vent characteristic obtained at the output section of the microphone 2 of the artificial ear shown in Fig. 4 using the same pent earphone from which the data in B was obtained, and is the data before conversion. Since the characteristics of the artificial ear shown in Figure 4 (b) are different from those of the 2CC coupler shown in Figure 1 (α), the obtained vent characteristics also differ from the curve (α) in Figure 2.
) has different characteristics. On the other hand, A is an example measured using the embodiments shown in FIGS. 4(α) and (b) using the same pentagonal earphone, and exhibits almost the same vent characteristics as the close-up measurements.
.... Next, a hearing aid using the embodiment shown in FIG. 4(α). The procedure for measuring insertion gain is shown. Insertion gain is a hearing aid. A close-up of the sound pressure inside the ear canal without the earphones being worn, and supplementary information. The ratio of the sound pressure inside the ear canal when the hearing device is worn in a close-up manner. It is expressed as 1゜The principle of measurement will now be explained. Hearing aid fitting letter. From equation (1), the sound pressure Pμ inside the coupler in the state is pv = Z
inc -U (4) The sound pressure pw inside the external auditory canal when a hearing aid is worn is expressed by formula (2) % Formula % (5) The sound pressure inside the coupler when a hearing aid is not worn is PO
1 Outside the state where the hearing aid is not attached to the close-up △ If the sound pressure in the auditory canal is po, the coupler in Figure 4 (h) is △
. In the case of the pseudo-class used, Po ``t P o holds true. Therefore, the insertion gain Ginr when worn in large-scale photography is expressed by the formula (4
), (7.1tLr from 51 = Gin
c・□ (6) Zinc Therefore, the hearing aid insertion gain Gi%C (Pt
Apply Zinr/Zinc correction to L/PO). Find the insertion gain Ginr in the large copy. I can do it. ,. The measurement procedure will be explained below with reference to FIG. Wearing hearing aids with non-vented ear threads in a pseudo-like manner (6
00). In this state, the hearing aid's impulse response Pu (t
) is measured (6(11)), and this impulse response pu(t) is converted into a frequency response pu,14(tu) using FFTK (602). Next, the hearing aid is removed from the pseudo analog, and the impulse response po<t> is
Measure and measure (6os). Similarly, this impulse response po(t) is converted into a frequency response po<w) by FFT (604). The hearing aid frequency name-answer Pυ(W) obtained in this way and the frequency response PO of the simulated naked ear
From (W), ・Hearing aid insertion gain Ginc in pseudo class
is calculated (1sO5). Further, in order to convert this into the hearing aid insertion gain Ginr K in close-up, (6)
Calculating formulas. Perform 5 (606). This result is sent to the external output device.
It is output (607). The above correction calculation (formula (6)) is performed in the measuring device 100 of the embodiment shown in FIG. 4(α). Furthermore, venting was performed according to the embodiment shown in FIG. 4 (α). The following describes the procedure for measuring hearing aid insertion gain using earphones with earphones. In the measurements, the vent characteristics and the insertion gain were measured sequentially. Large-scale external auditory canal when wearing a hearing aid using vented earphones △ If the sound pressure inside is pv, the insertion gain in large-scale is Gv.
i3r is △ △ where pu and /po represent the insertion gain Ginτ at the close-up pressure of the hearing aid using ventless earphones. △ △ pv / pu represents the vent characteristic Hr in real life -0 Therefore, a hearing aid using vented earphones. The insertion gain Gvinr when using large photos is Gvinr
= GinrTHr. Therefore, Gvinr sequentially calculates equations (6) and (5). j) obtained by calculating and finding their product. Below, make earphones with vents according to Figure 8. The procedure for measuring the insertion gain of the hearing aid used is shown below. . First, we supplemented the pseudo-type with earphones without vents. Wear hearing aids (700). In that state, the hearing aid
Let's measure the impulse response pu(t) (701), F
F.T. From K, this impulse response PtL(t) is expressed as the frequency response P
μ<w) (702). Next, attach a vent to the earphone, measure the impulse response pv(t) of the hearing aid (705), and use FFT to calculate the frequency response pv(t).
(w) K-transform (704). Furthermore, the hearing aid is removed from the pseudo analog, and the impulse response PO(t) is
of. 705) and impulse response using FFT. Transform PO(t) into frequency response po <w> K (7
06). In this way, the frequency responses of S types Pw(W), P
v (W), po (W). Of these, I was able to obtain a fake bare ear. From the frequency response PO(w) and the frequency response Pu,(W) of the hearing aid with non-vented earphones, in the pseudo-class. Calculate hearing aid insertion gain GirLC (7117)
. child. In order to convert this into the insertion gain Ginτ in the macrophotograph. Then, the calculation of equation (6) is performed (70B).
t. On the other hand, hearing aids using ventless earphones. Calculate the vent characteristic HC in the pseudo class from the frequency response pu < w) and the hearing aid frequency response Pυ (W) when using vented earphones. Convert(
710). Calculate the product of the insertion gain Ginr in the close-up and the vent characteristic Hτ obtained in this way (711), and calculate the insertion gain Gin in the close-up of the hearing aid using vented earphones.
Output r-Hr to an external output device (712). The above conversion calculation is based on the measurement of the embodiment shown in FIG. 4(a) ttc.
This is done in the device 100. A specific individual in the large copy of Impedance Zinr. Figure 31 (
h) Individual differences, which was not possible with conventional methods. It is also possible to calibrate hearing aids with this in mind. [Effects of the Invention] As described above, according to the present invention, the coupler. Earphone characteristics 5 in close-up can be easily and reliably determined from the earphone characteristics. 4. Brief Description of the Drawings FIG. 1 shows a conventional earphone characteristic measuring device. The configuration diagram of the coupler, Figure 2, is measured using a conventional coupler. Fig. 5 shows the vent characteristics and the close-up of the vent characteristics.
Figures (Q) to (d) are diagrams illustrating the principle of the present invention using vent characteristic measurement as an example, (α) is a diagram showing a state in which a ventless earphone is inserted into the coupler, and (A) is a diagram illustrating the electricity of (α). (c) is a diagram showing a vented earphone inserted into the coupler, (d) is an electrical equivalent circuit of (c), and FIG. 4 (α) is an earphone according to the present invention. FIG. 4 is a configuration diagram showing an embodiment of the ion characteristic measuring device. (h) illustrates an acoustic coupler and a pseudo analog used in the present invention. FIG. 5 is a flowchart for explaining the operation of the above embodiment. - The chart diagram, FIG. 6, is the ratio of the vent characteristics measured in the above example and the vent characteristics as measured by close-up. The comparison diagrams, FIGS. 7 and 8, respectively, are other figures of the present invention. Flow for explaining the measurement method in the example. It is a chart diagram. 2...~Iklophone, 1
゜3...Acoustic tube simulating the external auditory canal, 5...Acoustic tube, 104...Random access memory (RAM), 10
6... Read only memory (ROM"), 108...
- Arithmetic unit CAPU'), 5 109... Loudspeaker, 110... Central processing unit (CPU'), 201.
...X-Y plotter, 202...CRT display. Figure 1 Figure 2 Lachrymal fall (Hz) Figure 3 (Cl) (Shi) (C)
(d) Ko5 4self Figure 5 Item 6 100 +o
x Kite Table B (H,) δ Leap 7th Figure (

Claims (1)

[Claims] 1. An input terminal 5 for inputting sound pressure information in the acoustic coupler, and an earplug part of an earphone inserted into the coupler. The input impedance of the coupler seen from the tip (Zi, C
), large-scale tympanic membrane impedance and external auditory canal volume. Add the product and re-input the nine people impedance (Zinr) l
'A memory circuit 10 for storing sound pressure etc. in the coupler,
an arithmetic circuit that calculates vent characteristics; Ben is equipped with an output terminal that outputs the calculation results. A device for measuring vent characteristics of painted earphones, which is characterized by estimating and measuring vent characteristics in a close-up of the earphones. 152. The arithmetic circuit is (Hrz pen that can take a close-up picture of the human ear) 4? Characteristic Hc: Bent characteristics determined by Jtl using an acoustic coupler. ,. 26. A device for measuring vent characteristics of a pendant earphone according to claim 1, wherein the acoustic coupler performs the calculation of a sound tube and an end of the sound tube. 3. The device for measuring vent characteristics of a pendant earphone according to claim 2, comprising a small-diameter acoustic tube connected to an end. 4. The acoustic coupler connects the artificial head through an auricle formed on the outer periphery of the artificial head, which is equivalent to a human head. Claim 2 provided inside the head. 1' Device for measuring the vent characteristics of the pent earphone described above. 5. There is a suspicion that the pseudo-head has the same external shape as a human body. A vent characteristic meter/auxiliary device for a pencil earphone according to claim 4, which is attached to a similar body.
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